Processing multiple tabs: In my InputScript I try to enter values into entry fields in multiple tabs:

Screen SAPLIWP3.0201

Set ...
Set ...
Enter"=T\03"

Set ...
Set ...
Enter"=T\04"

Why doesn't this work?

You need an additional "Screen" command for each tab change, since the SAP application re-sends the screen for each new tab:

Screen SAPLIWP3.0201
Set ...
Set ...
Enter"=T\03"

Screen SAPLIWP3.0201
Set ...
Set ...
Enter"=T\04"